diff --git a/lib/krb5/Makefile.am b/lib/krb5/Makefile.am
index c3f4a27ad..5975cd36f 100644
--- a/lib/krb5/Makefile.am
+++ b/lib/krb5/Makefile.am
@@ -17,6 +17,7 @@ ERR_FILES = krb5_err.c heim_err.c
 libkrb5_la_SOURCES = \
 	addr_families.c \
 	address.c \
+	aname_to_localname.c \
 	asn1_glue.c \
 	auth_context.c \
 	build_ap_req.c \
diff --git a/lib/krb5/aname_to_localname.c b/lib/krb5/aname_to_localname.c
new file mode 100644
index 000000000..378441042
--- /dev/null
+++ b/lib/krb5/aname_to_localname.c
@@ -0,0 +1,77 @@
+/*
+ * Copyright (c) 1997, 1998 Kungliga Tekniska Högskolan
+ * (Royal Institute of Technology, Stockholm, Sweden). 
+ * All rights reserved. 
+ *
+ * Redistribution and use in source and binary forms, with or without 
+ * modification, are permitted provided that the following conditions 
+ * are met: 
+ *
+ * 1. Redistributions of source code must retain the above copyright 
+ *    notice, this list of conditions and the following disclaimer. 
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright 
+ *    notice, this list of conditions and the following disclaimer in the 
+ *    documentation and/or other materials provided with the distribution. 
+ *
+ * 3. All advertising materials mentioning features or use of this software 
+ *    must display the following acknowledgement: 
+ *      This product includes software developed by Kungliga Tekniska 
+ *      Högskolan and its contributors. 
+ *
+ * 4. Neither the name of the Institute nor the names of its contributors 
+ *    may be used to endorse or promote products derived from this software 
+ *    without specific prior written permission. 
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 
+ * SUCH DAMAGE. 
+ */
+
+#include <krb5_locl.h>
+
+RCSID("$Id$");
+
+krb5_error_code
+krb5_aname_to_localname (krb5_context context,
+			 krb5_const_principal aname,
+			 size_t lnsize,
+			 char *lname)
+{
+    krb5_error_code ret;
+    char *lrealm;
+    int foo;
+    size_t len;
+    char *res;
+
+    ret = krb5_get_default_realm (context, &lrealm);
+    if (ret)
+	return ret;
+
+    foo = strcmp (lrealm, aname->realm);
+    free (lrealm);
+    if (foo != 0)
+	return KRB5_NO_LOCALNAME;
+
+    if (aname->name.name_string.len == 1)
+	res = aname->name.name_string.val[0];
+    else if (aname->name.name_string.len == 2
+	     && strcmp (aname->name.name_string.val[1], "root") == 0)
+	res = "root";
+    else
+	return KRB5_NO_LOCALNAME;
+
+    len = strlen (res);
+    if (len >= lnsize)
+	return ERANGE;
+    strcpy (lname, res);
+    return 0;
+}